优雅的退出asyncio事件循环

import asyncio
import functools
import os
import signal

"""
信号值      符号      行为

2          SIGINT    进程终端，CTRL+C

9          SIGKILL   强制终端

15         SIGTEM    请求中断

20         SIGTOP    停止（挂起）进程 CRTL+D
"""


def exit(sign_name):
    print(f"获取信号{sign_name}: exit")
    loop.stop()


loop = asyncio.get_event_loop()
for sign_name in (‘SIGINT‘, ‘SIGTERM‘):
    loop.add_signal_handler(getattr(signal, sign_name),
                            functools.partial(exit, sign_name))

print(" Ctrl+C 停止运行.")
print(f"pid {os.getpid()}: 发送 SIGINT 和 SIGTERM 信号退出循环")
try:
    loop.run_forever()
finally:
    loop.close()